There is oil at the bottom of the oil tank wall; how can this be dealt with without affecting the painting quality?
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Here’s the situation: The crude oil tank that was used before is supposed to have its walls coated with anti-static paint. After steaming the tank for 48 hours, there are still many thumb-sized residues of oil on the wall surface (which is a bit sticky). How can the surface of the steel plate be prepared so that painting it yields better results? I’m very worried that these thumb-sized oil stains will prevent the paint from adhering to the tank walls. I hope experts with experience can give some advice! Besides steam, the method of corrosion using chemicals!
Simply put, it’s very easy – the best thing to do is choose the right cleaning agent. Look for it in the market; it should be there. The key issue is the construction plan regarding safety. Accidents are most likely to occur with this kind of thing. A kind reminder.
Does the cleaning agent have a brand or name?
Give *Baocha Yihaha a try. It’s best to find a cleaning service company to handle it.
If the oil stain is treated with steam first, and then paint is applied, and it is used on the inner walls. The adhesion of the protective layer after such painting will not be good, especially zinc-rich primers can cause the coating to peel off. It is recommended that after oil emerges from the tank walls, the metal surface be sandblasted to achieve a Sa2.5 grade before painting. Because the metal surface treatment does not achieve the surface finish and roughness required by the coating, painting is not possible.
It must meet the requirements of metal surface pretreatment specifications
Now, manually using a knife to remove the sludge, the container is sealed and steamed for 36 hours; when it is opened again, the inner wall of the container is very clean.
Since it is an oil storage tank used to store oil, even if the metal interior walls are cleaned thoroughly. However, when applying coatings to metal surfaces, it is required that the metal have a certain level of roughness; generally, a Ra value of 40–60 micrometers is sufficient. This can enhance the adhesion of the anti-corrosion coating after painting, thereby meeting the requirements of the anti-corrosion coating in terms of corrosion protection. Conversely, if the metal surface is smooth, the adhesion is low, failing to meet the requirements for adhesion of anti-corrosion coatings, and the coating will peel off and become ineffective very quickly.
Sandblasting is performed before painting
The question was about how to remove oil that has seeped into the inner wall of the tank, so as to ensure that it does not affect the adhesion of paint. The answer given was something about using sandblasting, which is simply absurd. After steaming, ventilate the tank; use forced ventilation for one week and natural ventilation for another week. Test the combustible gases inside the tank, and during the period of natural ventilation, enter the tank daily to check for any signs of oil leakage. Sandblasting can be carried out only after it is confirmed through testing that the conditions for welding are met; during the sandblasting process, it is necessary to check whether there are any signs of oil seepage on the metal surface. If oil has been absorbed into the metal of the tank wall, traces of oil seeping out after sandblasting can be seen. Control the extent to which you proceed – safety first; if you’re not sure, leave it unoccupied and well-ventilated for a longer period of time. In fact, the anti-corrosion treatment for the inner wall of the tank can be carried out using the “boot and cap” method, which ensures much better safety control.
Sandblasting tests were conducted on some areas with oil residues; sand particles adhered to those residues, preventing them from being removed.